Welding rods are mostly used for arc welding, and are composed of a core and a coating. The welding rod is to coat the coating (coating) evenly and centripetally on the welding core outside the metal welding core. Different types of electrodes have different cores. The welding core is the metal core of the welding rod. In order to ensure the quality and performance of the weld, there are strict regulations on the content of each metal element in the welding core, especially the content of harmful impurities (such as sulfur, phosphorus, etc.). The limit is better than the base material.
Welding wire is mostly used for TIG and MAG welding. It is used as a filler metal or as a conductive wire welding material at the same time. In gas welding and tungsten gas shielded arc welding, the welding wire is used as a filler metal; in submerged arc welding, electroslag welding and other molten electrode gas shielded arc welding, the welding wire is both the filler metal and the welding wire is also a conductive electrode. The surface of the welding wire is not coated with anti-oxidation flux. Welding wire is divided into solid-cored welding wire and flux-cored welding wire.